4

I want to edit manually my repo file from the command-line, preferably using sed. How can I do that based on the repo-name I want to edit?

I want to search for a specific repo-name (example: reponame-2) and based on that change, for example, the option enabled=1 to enabled=0

[repo-name1]
name=repo-name1
baseurl=http://linktomyrepo.com
enabled=1
sslverify=0
proxy=_none_


[repo-name2]
name=repo-name2
baseurl=http://linktomyrepo.com
enabled=1
sslverify=0
proxy=_none_
Jeff Schaller
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Asaf Magen
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3 Answers3

5

Perl's "paragraph mode", where "lines" are defined by consecutive newlines, is perfect for this:

$ perl -00pe 's/enabled=1/enabled=0/ if /\[repo-name1/' file [repo-name1]
name=repo-name1
baseurl=http://linktomyrepo.com
enabled=0
sslverify=0
proxy=_none_


[repo-name2]
name=repo-name2
baseurl=http://linktomyrepo.com
enabled=1
sslverify=0
proxy=_none_

Or, to edit the original file directly:

perl -i -00pe 's/enabled=1/enabled=0/ if /\[repo-name1/' file

Alternatively, you could use awk:

$ awk -vRS='\n\n' -vORS='\n\n' '/\[repo-name1/{sub(/enabled=1/,"enabled=0")}1;' file 
[repo-name1]
name=repo-name1
baseurl=http://linktomyrepo.com
enabled=0
sslverify=0
proxy=_none_

[repo-name2]
name=repo-name2
baseurl=http://linktomyrepo.com
enabled=1
sslverify=0
proxy=_none_

And, if you have a recent version of GNU-awk or any other awk suporting -i, you can do this to edit in place:

awk -iinplace -vRS='\n\n' -vORS='\n\n' '/\[repo-name1/{sub(/enabled=1/,"enabled=0")}1;' file

Alternatively, to avoid the extra blank lines that the awk above adds to the end of the file, you could do something more complex like:

$ awk -F= '/\[repo-name1/{a=1}/^\s*$/{a=0}a==1 && $1=="enabled"{$2=0}1;' file
[repo-name1]
name=repo-name1
baseurl=http://linktomyrepo.com
enabled 0
sslverify=0
proxy=_none_

[repo-name2]
name=repo-name2
baseurl=http://linktomyrepo.com
enabled=1
sslverify=0
proxy=_none_
terdon
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  • works very well. it would be nice if i could use sed or awk. because im not sure all my systems has perl installed by default. – Asaf Magen Jun 15 '16 at 17:30
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    @AsafMagen the vast majority of *nix systems will have Perl installed. Granted, not all, so I added ann awk solution as well. – terdon Jun 15 '16 at 17:52
2

Something like this:

sed -i '/repo-name1/{n;n;n;s/enabled=1/enabled=0/}' repos.txt

This requires that enabled= always be at the third line after repo name.

Vombat
  • 12,884
2

With awk one can set record separator to double newlines to in some way simulate perl's paragraph mode as in terdon's answer:

awk 'BEGIN{RS="\n\n";OFS="\n"} \
     /repo-name1/{for(i=1;i<=NF;i++) if($i=="enabled=1") $i="enabled=0"}1' file
Community
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jimmij
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  • You might also want to set ORS so that the blank lines are kept in the output. – terdon Jun 15 '16 at 17:54
  • @terdon yes, I see that you added your awk solution with this, but one will end up with blank lines also at the end of the file. awk is not best for this job, perl is better. – jimmij Jun 15 '16 at 17:59
  • Never mind, I added another approach that avoids the newlines. – terdon Jun 15 '16 at 18:03